cancel
Showing results for 
Search instead for 
Did you mean: 
cancel
2189
Views
5
Helpful
10
Replies

3750 v 3750 E Series

chrish100
Level 1
Level 1

I have a simple question that I can not find a direct answer to. In a stand alone configuration does the 3750 E have a faster backplane than the 3750? The 3750 has a 32 Gb/s backplane which for a 48 port switch is oversubscribed. what is the (non stacked) backplane of a 3750 E.

Please don't reply that I should use the 3560 in such a situation.

Thanks

10 Replies 10

Chris,

Please check out this link:

Cisco Catalyst 3750-E Series Key Features

• StackWise Plus for ease of use and resiliency with up to 64 Gbps of throughput

http://www.cisco.com/en/US/prod/collateral/switches/ps5718/ps7077/prod_qas0900aecd805bbea5.html

Edit : Sorry I missed reading the whole question.

http://www.cisco.com/en/US/prod/collateral/switches/ps5718/ps7077/product_data_sheet0900aecd805bbe67.html

WS-C3750E :

160-Gbps wire rate, nonblocking switching fabric capacity

HTH,

Toshi

Joseph W. Doherty
Hall of Fame
Hall of Fame

3750-E (and 3650-E) backplane's bandwidth is also documented at 128 Gbps. (Also 48 port models are rated at 101.2 Mpps.)

BTW, non-oversubscribed would require 136 Gbps for 48 gig ports and dual 10 gig (as found on the 4948-10GE).

Joseph

3750-E datasheet states that switching fabric capacity is 160Gbps which would mean based on your figures that the 3750-E 48 gig port switch is not oversubscribed ?

Jon

Jon, if 3750-E does have 160-Gbps fabric bandwidth, it wouldn't be oversubscribed. However, if you search Cisco's site, you'll find other documentation that notes the 3560-E/3750-E fabric bandwidth is 128 Gbps. (More fun, Cisco's switch guide notes fabric as 64 Gbps.)

Since some documentation lists switch as wire rate capable, I would lean toward a fabric of 160 Gbps.

Guys,

So we sometime need to find the correct document outside cisco world. J/K (grin)

Toshi

Or, we take all the different figures, add them up and divide by the number of figures to get an average :-)

Yes, had this problem before with conflicting documentation on the 6500 switches.

I think 64Gbps is the connection between 3750-E switches in a stack rather than the actual switch fabric per switch so you could argue in a stack it is definitely not wire rate if all ports in one switch were talking to all ports in another switch in the same stack.

As fo 128Gbps - pass, i haven't a clue where that figure comes from :-)

Jon

Jon,

I have to agree with you on what we have to to do is "Average".

5P! I love that clue. (grin)

Toshi

128 Gbps, see attachments.

64 Gbps fabric, see http://www.cisco.com/en/US/prod/switches/ps5718/ps708/networking_solutions_products_genericcontent0900aecd805f0955.pdf, pages 108 and 109.

BTW, so far I've only found the 160 Gbps reference with regard to the 3750-E. I wonder if this is some additional bandwidth for Stackwise+, although its only an additional 32 Gbps not 64 Gbps.

Thank you all very much.

Getting Started

Find answers to your questions by entering keywords or phrases in the Search bar above. New here? Use these resources to familiarize yourself with the community:

Innovations in Cisco Full Stack Observability - A new webinar from Cisco